In order to migrate some (few) old clock drivers to the common
mtk_clk_simple_probe() function, add dummy clock ops to be able
to insert a dummy clock with ID 0 at the beginning of the list.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
Reviewed-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
Tested-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
---
drivers/clk/mediatek/clk-mtk.c | 16 ++++++++++++++++
drivers/clk/mediatek/clk-mtk.h | 19 +++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index cf2f465ecf22..ca9aa24e769c 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -18,6 +18,22 @@
#include "clk-mtk.h"
#include "clk-gate.h"
+const struct mtk_gate_regs cg_regs_dummy = { 0, 0, 0 };
+EXPORT_SYMBOL_GPL(cg_regs_dummy);
+
+static int mtk_clk_dummy_enable(struct clk_hw *hw)
+{
+ return 0;
+}
+
+static void mtk_clk_dummy_disable(struct clk_hw *hw) { }
+
+const struct clk_ops mtk_clk_dummy_ops = {
+ .enable = mtk_clk_dummy_enable,
+ .disable = mtk_clk_dummy_disable,
+};
+EXPORT_SYMBOL_GPL(mtk_clk_dummy_ops);
+
static void mtk_init_clk_data(struct clk_hw_onecell_data *clk_data,
unsigned int clk_num)
{
diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index cd97d2722380..ed329d8d7349 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -22,6 +22,25 @@
struct platform_device;
+/*
+ * We need the clock IDs to start from zero but to maintain devicetree
+ * backwards compatibility we can't change bindings to start from zero.
+ * Only a few platforms are affected, so we solve issues given by the
+ * commonized MTK clocks probe function(s) by adding a dummy clock at
+ * the beginning where needed.
+ */
+#define CLK_DUMMY 0
+
+extern const struct clk_ops mtk_clk_dummy_ops;
+extern const struct mtk_gate_regs cg_regs_dummy;
+
+#define GATE_DUMMY(_id, _name) { \
+ .id = _id, \
+ .name = _name, \
+ .regs = &cg_regs_dummy, \
+ .ops = &mtk_clk_dummy_ops, \
+ }
+
struct mtk_fixed_clk {
int id;
const char *name;
--
2.39.0
